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Old Kent Road is a fascinating MC variant where a play of Old Kent Road causes the game to switch between two distinct states. The most common version switches between play above ground and below ground, but it is also possible to switch networks (e.g. Mornington Crescent/Chateau D'Eau) or perform other more exotic changes. Probably the most extreme variant is to switch between standard and Reverse Mornington Crescent which is very challenging and has even been dismissed by some Mornington Crescent experts as impossible. Other players do not know the meaning of 'impossible' (or 'prevaricate' or 'mulch') and thus have been known to foolishly insist on trying it. These ignorant players may be pleased to know that a definition of 'mulch', at least, is now available online.